Working of Liquid Ring Vaccum Pumps

By rotating a vaned impeller eccentrically within a cylindrical casing, the liquid-ring pump compresses gas. The pump is fed with liquid (usually water), which forms a moving cylindrical ring against the inside of the casing due to centrifugal acceleration. This Liquid Ring Vaccum Pumps for

Liquid Ring Vaccum Pumps

Liquid Ring Vaccum Pumps

ms a series of seals between the impeller vanes, forming compression chambers. The eccentricity of the impeller’s axis of rotation and the geometric axis of the casing causes a cyclic variation in the volume enclosed by the vanes and the ring.


Gas, usually air, is drawn into the pump via an inlet port at the casing’s end. The gas is contained within the compression chambers formed by the impeller vanes and the liquid ring. The compression caused by the impeller rotation compresses the gas, which reports to the discharge port at the casing’s end. On pump discharge, compressed gas contains a small amount of working liquid, which is usually removed in a vapor-liquid separator.

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